... 4.25 Boiling Point (1 atm), 32.05 Critical density, g/cm3 0.433 Freezing point (1 atm), -103.5 ... of boiling point, KJ / kg 223.0 Density (25), liquid, g/cm3 1.227 thermal conductivity of steam (1 atm, ... 25), mw / mk 8.3 Vapor density (air = 1) 4.1 Solubility in ... 99.5 Moisture, mg / kg 50.0 Acidity (HCl in terms), mg / kg 1.0 Evaporation residue, mg / ...